Tag: inherited changes

Questions Related to inherited changes

What is the probability of three daughters to a couple in three children?

  1. $\dfrac{1}{4}$

  2. $\dfrac{1}{8}$

  3. $\dfrac{1}{16}$

  4. $\dfrac{3}{8}$


Correct Option: A

A family has five girls and no son, the probability of the occurrence of son in $6^{th}$ child is?

  1. $1/2$

  2. $1/5$

  3. $1$

  4. No chance


Correct Option: A

Find out the frequency of AabbCcDdee if parents are AabbCCddEe and AabbccDdee.

  1. $0.78\%$

  2. $12.5\%$

  3. $25\%$

  4. $50\%$


Correct Option: A

A family of five daughter only is excepting sixth issue. The change of its beings a son is?

  1. $0\%$

  2. $25\%$

  3. $50\%$

  4. $100\%$


Correct Option: C
Explanation:

If you have five girls and expect a sixth child, then there is a  chance that it will be a boy slightly more than 50%.

So, the correct option is '50%'.

A human male is heterozygous for two autosomal genes A & B and homozygous dominant for 3rd autosomal gene C. The individual is having sry gene (S) on its Y-chromosome. What will be the probability of sperms to carry abcS condition? 

  1. $\frac{1}{4}$

  2. $\frac{1}{8}$

  3. $0$

  4. $\frac{1}{16}$


Correct Option: A

Assume that the occurrence of nitrogen bases in adjacent positions in a DNA strand is random. Identify the minimum number of nucleotides in a DNA strand where GAAT can occur once on the basis of probability

  1. 512

  2. 256

  3. 4096

  4. 1024


Correct Option: B

Assume that the occurrence of nitrogen bases in adjacent positions in a DNA strand is random. Identify the minimum number of nucleotides in a DNA strand where GAAT can occur on the basis of probability.

  1. $512$

  2. $256$

  3. $4096$

  4. $1024$


Correct Option: A

Probability of getting fairly light and light progeny from mulattoe and albino parents in

  1. $\cfrac{15}{64}$ and $\cfrac{6}{64}$

  2. $\cfrac{20}{64}$ and $\cfrac{15}{64}$

  3. $\cfrac{3}{8}$ and $\cfrac{1}{8}$

  4. $\cfrac{3}{8}$ and $\cfrac{3}{8}$


Correct Option: A

In an organism punk is a sex-linked recessive trait and black hair heterozygous female is mated to white male which is not spotted, the phenotypic ratio of the offspring would be :

  1. 1/4 spotted black; 1/4 pink spotted white; 1/4 unspotted black; 1/4 uspotted white

  2. 1/2 spotted black; 1/2 pink spotted white

  3. 3/4 pink spotted black; 1/4 pink spotted white

  4. 3/4 unspotted black; 1/4 pink spotted white


Correct Option: A

A man with pure blue eyes and pure black hair marries a woman with black eyes and red hair. (Black eyes are dominant over blue eyes and black hair over red hair). What will be the probabilities of phenotypes of the children?

  1. $50$% with black eyes and black hair, and $50$% blue eyes and black hair

  2. All will be with black eyes and black hair

  3. Both the above cases are possible

  4. $1 : 1 : 1 : 1$


Correct Option: A